@tschk/crepuscularity-wasm

The crepuscularity parser, compiled to WebAssembly. This is the same Rust code that backs the crepus CLI — not a reimplementation — so JavaScript consumers and native targets lower templates identically.

import { parseCrepus, IR_VERSION } from "@tschk/crepuscularity-wasm";

const ir = parseCrepus(`div flex flex-col gap-4\n  span text-lg\n    "hello"`);
// { version: 6, root: [ { kind: "stack", ... } ] }

Template variables are bound by passing a context object:

parseCrepus('span\n  "hello {name}"', { name: "Ada" });

Other syntaxes

parseTemplate picks a frontend from the filename, so .crepus, .jsx/.tsx, .svelte and .vue all compile to the same View IR:

import { parseTemplate } from "@tschk/crepuscularity-wasm";

parseTemplate('<div class="flex"><span>{t}</span></div>', "Panel.svelte");
parseTemplate("<template><div class=\"flex\">{{ t }}</div></template>", "Panel.vue");

These are first-party frontends: neither svelte nor vue is a dependency. They compile the template. A <script> block is extracted and its semantics — Svelte runes, Vue's composition API, stores, lifecycle — are not executed; expressions are evaluated by crepuscularity's own evaluator. A construct the shared AST cannot represent is a parse error rather than a silent drop.

View IR

parseCrepus returns a ViewIr, a versioned tree of ViewNodes. Every node carries the original template class tokens on style.classes, so web renderers can pass them straight through as className instead of re-deriving CSS from the lowered style hints.

Check IR_VERSION if you persist or transport IR — the schema is versioned and bumps on incompatible changes.

Building

Requires the wasm32-unknown-unknown target and a wasm-bindgen CLI matching the wasm-bindgen crate version.

./build.sh